摘要
硫铝酸盐水泥是一种潜在固井材料,其固井界面胶结强度及微观结构尚不明确,为此进行硫铝酸盐水泥浆胶结界面胶结强度增强机理实验研究。采用X射线衍射仪研究硫铝酸盐水泥浆的水化机理,利用胶结强度测试装置测定硫铝酸盐水泥浆固井界面胶结强度,利用扫描电子显微镜和X射线能谱分析表征固井界面的微观结构及化学组分。研究结果表明:龄期为1 d、3 d、7 d时,硫铝酸盐水泥与套管的胶结强度比同龄期G级水泥分别提高了24.3%、20.1%和25.3%;微观分析结果表明,套管表面聚集着大量Al元素(AH3凝胶),其高聚合度可以降低界面处的孔隙率,从而提高硫铝酸盐水泥石的界面封固性能。
Sulpho-aluminate cement is a kind of potential cementing material,and its microstructure and cementation strength at the cementing interface have not been figured out.In regard of this,the reinforcement mechanisms of cementation strength at the cementing interface of sulpho-aluminate cement slurry were experimentally studied.The hydration mechanisms of sulpho-aluminate cement slurry were investigated by using the X-ray diffractometer,the cementation strength at the cementing interface of sulphoaluminate cement slurry were measured by means of the cementation strength test unit,and the microstructure and chemical compositions at the cementing interface were characterized by virtue of scanning electron microscope(SEM)and X-ray energy spectrum analysis.It is shown that the cementation strength between the sulpho-aluminate cement and the casing at the age of 1 d,3 d and 7 d is 24.3%,20.1% and 25.3% higher than that of G-grade cement of the same age.The microscopic analysis result indicates that a large amount of Al element(AH3 gel)accumulates on the surface of the casing,and its high polymerization degree can decrease the porosity at the interface,so as to improve the interface cementing performance of sulpho-aluminate set cement.
作者
宋梅梅
窦益华
杨振杰
张勇
程凯凯
SONG Meimei;DOU Yihua;YANG Zhenjie;ZHANG Yong;CHENG Kaikai(College of Mechanical Engineering,Xi’an Shiyou University,Xi’an 710065,Shaanxi,China;College of Petroleum Engineering,Xi’an Shiyou University,Xi’an 710065,Shaanxi,China)
出处
《石油钻采工艺》
CAS
北大核心
2019年第1期43-47,62,共6页
Oil Drilling & Production Technology
基金
国家自然科学基金面上项目"页岩气水平井压裂与生产套管变形机理及其控制机制研究"(编号:51674199)
硅酸盐建筑材料国家重点实验室(武汉理工大学)开放基金项目"用于油气田固井的玻璃纤维增韧硫铝酸盐改性硅酸盐水泥设计制备与应用研究"(编号:SYSJJ2019-17)
陕西省教育厅专项科研计划项目"玻璃纤维硫铝酸盐固井水泥浆改善固井质量作用机制研究"(编号:18JK0618)
关键词
硫铝酸盐水泥
固井
胶结界面
胶结强度
微结构
固井质量
sulpho-aluminate cement
cementing
cementing interface
cementation strength
microstructure
cementing quality
